im still having problems with my engine idling weird. once the engine warms up after the car has been driven for 15-20 minutes the idle goes up and down and every time it goes down it seems to be going lower than the last time and then the check engine light comes on. as soon as I step on the accelerator a little to give it some gas, usually while in neutral, the light will go off and the engine sounds fine as long as it isn't idling.

 

trying adjust the throttle on the throttle body to adjust the idle, thats what we did for my friends 240. it would cut out when you made a turn in 2nd gear. so thats what we did to fix that.